What Do X-ray Spectra and Timing Reveal?

How do energy and timing measurements probe hot matter near a black hole?

You followed photon energy and arrival time into spectra, light curves, a timing lag, and a model-dependent view of the hot accretion flow.

An artistic reconstruction of gas flowing from a companion star into a hot accretion disk and compact X-ray corona around an unseen black hole. — Vastward artistic reconstruction. The disk, corona, and colour coding introduce the system, but they are not a resolved X-ray photograph or a measured geometry.

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